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December 3, 2024 at 4:15 pm
dlooman
Ansys Employee

It appears you have mainly natural convection (no fan blowing air over the bodies.)  So it would be interesting to see if the handbook values for natural convection produce the correct temperature.   The fly-out menu for the film coefficient in Mechanical has an option to "Import Temperature Dependent..."  One of the temperature dependent options is for stagnant air and a horizontal cylinder.  This option uses the formula below.  It could be close to your case.  

Stagnant Air, Horizontal Cylinder, Turbulent Case. Using h = 1.24(Tw-Tb)**1/3, GrPr greater than 10e9. Ref. Holman, "Heat Transfer," McGraw Hill, 5th ed., p285.